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They're just spongebob texting "gamer".

I think he's making fun of the over the top gamer branding some technology products have.

It's not an acronym, it's the word "gamer" written in something akin to leetspeak [1].

Believe it's use of Mocking Spongebob style https://knowyourmeme.com/memes/mocking-spongebob

Oh.

its "gamer" like "video game player". not an acronym.

That's incomplete, it turns out; apparently it's a weirdly capitalized form of "gamer" with sarcastic/disrespectful intent towards the referenced group.